Indo-European languages like English & Sanskrit had a common ancestor 8,100 years ago!
Digging up the Roots of Indo-European Languages
Sumerians invented the system of time 5,000 years ago (video)
...and we still use it today!
The Rise and Fall of the Mighty Bulgars and the First Bulgarian Empire
In 1018, the Byzantine Emperor Basil II dealt a decisive blow to Bulgaria by capturing the capital city of Preslav